Recent Advances in PGPR and Molecular Mechanisms Involved in Drought Stress Resistance

Sati, Diksha; Pande, Veni; Pandey, Satish Chandra; Samant, Mukesh

doi:10.1007/s42729-021-00724-5

Cited by 57 publications

(43 citation statements)

References 159 publications

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“…In addition, under suboptimum conditions, plants release some photosynthetic assimilates as root exudates, which helps maintain bacterial colonization in the root zone, promoting mutual benefits such as increased plant resistance against abiotic stress (Samaniego-Gaḿez et al, 2016). It was reported that PGPR elevate photosynthesis in in plants by regulating endogenous sugar/abscisic acid signaling (Sati et al, 2021). In the present study, plants inoculated with Pseudomonas and Pantoea increased gas exchange, respiration, stomatal conductance and leaf transpiration under drought-stressed and well-watered conditions.…”

Section: Discussionsupporting

confidence: 55%

Seed Endophyte bacteria enhance drought stress tolerance in Hordeum vulgare by regulating, physiological characteristics, antioxidants and minerals uptake

et al. 2022

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Growth stimulating bacteria help remediate dry arid soil and plant stress. Here, Pseudomonas sp. and Pantoea sp. we used to study the stress ecology of Hordeum vulgare and the environmental impact of water deficit on soil characteristics, growth, photosynthesis apparatus, mineral acquisition and antioxidiant defense. Plants inoculated with Pseudomonas or Pantoea had significantly higher (about 2 folds) soil carbon flux (soil respiration), chlorophyll levels (18%), net photosynthetic rate (33% in Pantoea and 54% in Pseudomonas), (44%) stomatal conductance than uninoculated plants in stressed conditions. Both bacterial strains improved leaf growth (23-29%) and root development under well-watered conditions but reduced around (25%) root biomass under drought. Plants inoculated with Pseudomonas or Pantoea under drought also increased of about 27% leaf respiration and transpiration (48%) but decreased water use efficiency, photoinhibition (91%), and the risk of oxidative stress (ETR/A) (49%). Drought stress increased most of the studied antioxidant enzymatic activities in the plants inoculated with Pseudomonas or Pantoea, which reduce the membrane damage and protect plants form oxidative defenses. Drought stress increased K+ acquisition around 50% in both shoots inoculated with Pseudomonas or Pantoea relative to non-stressed plants. Plants inoculated with Pseudomonas or Pantoea increased shoot Na+ while root Na+ only increased in plants inoculated with Pseudomonas in stressed conditions. Drought stress increased shoot Mg2+ in plants inoculated with Pseudomonas or Pantoea but did not affect Ca2+ relative to non-stressed plants. Drought stress increased about 70% K+/Na+ ratio only in plants inoculated with Pseudomonas relative to non-stressed plants. Our results indicate that inoculating barley with the studied bacterial strains increases plant biomass and can therefore play a role in the environmental remediation of drylands for food production.

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Section: Discussionsupporting

confidence: 55%

Seed Endophyte bacteria enhance drought stress tolerance in Hordeum vulgare by regulating, physiological characteristics, antioxidants and minerals uptake

et al. 2022

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“…Furthermore, PGPB, which are natural soil inhabitants of the rhizosphere as well as excellent colonizers of plant internal compartments and surfaces, may efficiently overcome the harmful effects of drought stress in plants (Sati et al, 2022). Azospirillum, Azotobacter, Bacillus, Klebsiella, Paenibacillus, Pseudomonas, Rhizobium, and Serratia, are the popular plantassociated PGPB genera (Abdelaal et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Efforts towards overcoming drought stress in crops: Revisiting the mechanisms employed by plant growth-promoting bacteria

et al. 2022

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Globally, agriculture is under a lot of pressure due to rising population and corresponding increases in food demand. However, several variables, including improper mechanization, limited arable land, and the presence of several biotic and abiotic pressures, continually impact agricultural productivity. Drought is a notable destructive abiotic stress and may be the most serious challenge confronting sustainable agriculture, resulting in a significant crop output deficiency. Numerous morphological and physiological changes occur in plants as a result of drought stress. Hence, there is a need to create mitigation techniques since these changes might permanently harm the plant. Current methods used to reduce the effects of drought stress include the use of film farming, super-absorbent hydrogels, nanoparticles, biochar, and drought-resistant plant cultivars. However, most of these activities are money and labor-intensive, which offer limited plant improvement. The use of plant-growth-promoting bacteria (PGPB) has proven to be a preferred method that offers several indirect and direct advantages in drought mitigation. PGPB are critical biological elements which have favorable impacts on plants’ biochemical and physiological features, leading to improved sugar production, relative water content, leaf number, ascorbic acid levels, and photosynthetic pigment quantities. This present review revisited the impacts of PGPB in ameliorating the detrimental effects of drought stress on plants, explored the mechanism of action employed, as well as the major challenges encountered in their application for plant growth and development.

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“…Indeed, plants and their rhizosphere host diverse microbial communities, selected from bulk soil (Bulgarelli et al, 2012), and the beneficial bacteria, defined as Plant Growth-Promoting Bacteria (PGPB), can establish symbiotic associations to promote plant growth under optimal conditions or in response to biotic and abiotic stresses (de Zelicourt et al, 2018; Finkel et al, 2017; Saad et al, 2020; Synek et al, 2021). A number of PGPBs have been reported to mitigate drought stress in a variety of plant species implicating a number of processes, such as modification of phytohormonal levels, production of heat-shock proteins and dehydrins, production of osmolytes, exopolysaccharides, volatiles, detoxification of reactive oxygen species (ROS) and the accumulation of compatible solutes like sugars, amino acids and polyamines (Sati et al, 2022). However, a detailed molecular and genetic analysis of the underlying molecular mechanisms has not been done so far.…”

Section: Introductionmentioning

confidence: 99%

Microbe-induced plant drought tolerance by ABA-mediated root morphogenesis and epigenetic reprogramming of gene expression

Alwutayd

Rawat

Sheikh

et al. 2023

Preprint

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The use of beneficial microbes to mitigate drought stress tolerance of plants is of great potential albeit little understood. We show here that a root endophytic desert bacterium, Pseudomonas argentinensis sp. SA190, enhances drought stress tolerance in Arabidopsis. Transcriptome and genetic analysis demonstrate that SA190-induced root morphogenesis and gene expression is mediated via the plant abscisic acid (ABA) pathway. Moreover, we demonstrate that SA190 primes the promoters of target genes in an epigenetic manner which is ABA-dependent. Application of the SA190 priming technology on crops is demonstrated for alfalfa in field trials, showing enhanced performance under desert agriculture conditions. In summary, a single beneficial root bacterial strain can help to perform agriculture under drought and water limiting conditions.

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Recent Advances in PGPR and Molecular Mechanisms Involved in Drought Stress Resistance

Cited by 57 publications

References 159 publications

Seed Endophyte bacteria enhance drought stress tolerance in Hordeum vulgare by regulating, physiological characteristics, antioxidants and minerals uptake

Seed Endophyte bacteria enhance drought stress tolerance in Hordeum vulgare by regulating, physiological characteristics, antioxidants and minerals uptake

Efforts towards overcoming drought stress in crops: Revisiting the mechanisms employed by plant growth-promoting bacteria

Microbe-induced plant drought tolerance by ABA-mediated root morphogenesis and epigenetic reprogramming of gene expression

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